<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="utf-8">
    <link rel="stylesheet" href="./index.css">
    <title>12 新拟态输入框</title>
</head>
<body>
<div class="app">
    <input type="text" placeholder="用户名/邮箱">
</div>
</body>
</html>